Distributor plate



Dec, 17, 1929;; J. F. MARTIN DISTRIBUTOR PLATE Filed April 5, 1929 INVENTOR fmdrbin @4 154.)

ATTORNEY Patented Devc, ,1,

UNITED STATES PAT NT OFFICE JOHN F. MARTIN, F SPRINGFIELD, MASSACHUSETTS, ASSIGNOR To AMERICAN BOSCH MAGNETO CORPORATION, OF SPRINGFIELD, MASSACHUSETTS, A CORPORA- TION OF NEW YORK Application filed A ril 5,

This invention relates to magnetos, and more particularly to an Improvement in the construction of the distributor plate.

In present day types of magnetos, the

distributor plate consists of a unitary casting of insulating material having a plurality of radially disposed distributing brushes, a cen-- tral distributor brush, and a depending col lector brush. The latter part projects into a casing enclosing the collector ring and makes contact therewith. This unitary construction has one serious disadvantage, in that upon removal of the said unitary distributor plate the depending part holding the collector brush is likely to be broken off between the walls of the casing. An object of this invention therefore is to make the distributor plate of uch construction that removal thereof will obviate any such possibility, and I do so preferably by modifying the construction of the distributor So that it comprises two separate parts or units, one having the radially arranged distributor brushes, and the other the central brush and collector brush, and mounting both neto.

By this arrangement, further, the construction of the distributor plate is cheapened and simplified in that it permits said plate to be made in such form as tohave a plane sealing" surface adapted to enclose the internal gears and discs of the magneto. a

A preferred embodiment of this invention is illustrated in the accompanying drawing,

' wherein,

Fig; -1 is a front elevation, partly in section, of the assembled relationshlp of my 1mprovedconstruction to a magneto, and

Fig. 2 is a Side view, partly in section, on

the line 22 of Fig. 1.

Th'magneto comprises the usual magnet l, armature 2 mounted on the shaft 3, collector ring 4, distributor gear 5 driven by a geaj'nfi mounted on the shaft 3, and distributor disc 7, which is integral with the distributor gear 5. The distributor disc and gear fare rotated by the shaft in the usual way, and the distributor disc hasembedded in it a conducting segment (not shown) which makes successive contact with the radial disparts Separately on the mag- DISTRIBUTOR PLATE 1929. Serial No. 352,788.

tributor brushes, 8, 8 projecting from the dis tributor plate 9.

Instead of mounting the central distributor brush and collector brush in said distributor plate as is now the common practice, I mount these brushes in a separate member 10, the collector brush 11 depending therefrom and making contact with the collector ring and the center brush 12 projecting horizontally from said member and making contact with a centered part of an extension from the conducting segment in said distributor disc (not shown). The two brush holding members 9 and are separately mounted on separate supporting structures. The distributor plate is provided with a circumferential groove 13 in which is placed a packing ring or seal 14, and the plate is mounted on the circular frame 15, the plate beingheld closely thereagainst by the usual clamping mer' bers 16. The lower horizontal edge 16 of the distributor plate is alsoprovided with a construction of the groove and seal above mentioned and said edge is made to abut against a shoulder 17 on the shaft housing 18. i

The member 10 is disposed between the distributor plate and the disc and its depending portion projects through an opening in the shaft casing to impinge upon the collector ring. The said member is provided with lateral extensions 19, 19, which are supported on the shaft casing at 18 and secured thereto by screws 20, 20.

Having described my invention, what I claim is: V

1. In a. magneto, a distributor plate mounted on one end thereof having radially disposed brushes, and a separate, integral member partially encased by said plate having a collector brush and a center brush.

2. In a magneto, a distributor plate mounted on the drive end thereof having radially disposed brushes, and a separate, in

pending member partially encased by said plate and having a collector brush and a center brush.

l. In a magneto, a distributor plate mounted on the drive end thereof having radially disposed brushes, and a separate, integral depending member mounted on the same end having a collector brush and a center brush.

5. The combination with a magneto havinga shaft driven armature, a collector ring on said shaft,a casing for said shaft and ring, a distributor gear and disc driven by said shaft, and a frame for said gear and disc, of-a distributor plate mounted on said frame having radially disposed brushes contacting with said disc, and a separate, integral brush-holding member disposed between said plate and said disc, said. member being supported on said casing and having a depending col lector brush contacting with said ring and a center brush cont-acting with said disc.

6. The combination with a magneto having a shaft driven armature, a collector ring on said shaft, a casing for said shaft and ring, a distributor gear and disc driven by said shat-t, and a frame for said gear and disc, of a distributor plate mounted on said frame having radially disposed brushes contacting with said disc, and a separate, integral brush-holding member disposed be tween said plate and said disc and having lateral extension whereby the same may be supported and secured to said casing, said member having a depending collector brush contacting with said ring and a'center brush contacting with said disc.

In testimony whereof I affix my signature.

JOHN F. MARTIN. 

